By default HealthVault will only return a certain number of "full" health record items
for any query. It then returns the "keys" for the remaining items that matched the
query which can then be queried for by ID. HealthRecordItemCollection
automatically manages this paging for you. However, if you want further control over
the count of full items retrieved on each request,
MaxFullItemsReturnedPerRequest can be set to optimize for smaller sets
of data. For example, let's say the data being retrieved is being displayed in a
GridView and the results are shown 10 items per page. Rather than get the default
number of full things, you can request 10 full items per request. Then only if the
user clicks to the second page would you need to get the next 10 items.